I will try to locate and recheck my source but I found this information a long time ago. The problems described by my source are the following. The hole in the pentagon was not large enough for the model of plane that struck the building. The plane burned so thoroughly that none of the plane was recovered inside the pentagon yet all of the bodies were recovered. The only piece of the plane recovered was a piece of an engine recovered outside the building that "could not be identified as a piece of the type of plane that hit the pentagon". Explosives experts interviewed at the pentagon right after the event claimed they smelled the explosive cordite and not jet fuel as expected.

It is possible and even probable that a plane struck the pentagon. I will try to relocate the articles and links that describe these troubling questions. I read this information years ago and the questions I have are just the ones that stuck out.

Why did the towers fall like a demolition and not topple like a tree. If you can explain the towers collapse with melting inner support beams what about bldg 7. It was never struck and collapsed in the same demolition type manner. The only explanation I have seen offered was that it was possibly poor construction.